Colorado · Census place 0853395

New Castle, Colorado

New Castle is a town in Garfield County, Colorado with an estimated 4,894 residents on July 1, 2024. It is the 80th largest of 149 incorporated places of 1,000+ people in the state.

Population 2024: 4,894; #80 of 149 in Colorado
Change since 2020: -0.3%; -17 people
Land area: 2.5 sq mi; + 0.09 sq mi water
Density: 1,958 / sq mi; State median 1,848

Orange pin: New Castle. Shaded: its county. Dark pin: Denver.

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Tools and pages that start from New Castle

New Castle population, 2020 to 2024

New Castle lost 17 residents from July 2020 to July 2024, a change of -0.3%. In the latest year it moved by +20.

July 1 estimates. The April 2020 estimates base was 4,915. The axis starts above zero so yearly changes are visible.

New Castle covers 2.50 square miles of land and 0.09 of water, for 1,958 people per square mile of land. The median Colorado place of 5,000+ has 1,848, so New Castle is close to the typical town.

What county New Castle is in

All of New Castle's residents live in Garfield County, which had 63,167 residents in 2024. New Castle holds 7.7% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in New Castle

1 ZIP Code Tabulation Area (ZCTA) overlaps New Castle by at least 10% of the ZCTA's or the town's land: 81647. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a town that annexed land after 2020 may reach into ZIP codes not listed here.

Where New Castle is

The Census internal point of New Castle is at 39.577600, -107.526500. Denver, the capital, is 135.6 miles E in a straight line. The nearest larger place is Glenwood Springs, CO (10,311 people), 10.0 miles away. The nearest city of 100,000 or more is Boulder, CO, 124.6 miles away.

Internal point

Decimal: 39.577600, -107.526500
DMS: 39°34'39.36"N 107°31'35.40"W
UTM: 13N 283002.4E 4383926.0N
Geohash: 9x591hvs4
Plus code: 85FJHFHF+2C

Daylight in New Castle

At 39.58° N, New Castle gets about 14 h 58 min of daylight around the June solstice and 9 h 22 min around the December solstice, a swing of 5 h 36 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near New Castle

The eight nearest incorporated places of 1,000+ in Colorado, measured between internal points. The closest is Silt, 7.0 miles away, with 3,727 people.

Questions people ask

What is the population of New Castle, CO?

4,894 on July 1, 2024, in the Census Vintage 2024 estimates. That is down 17 (0.3%) from 4,911 in July 2020.

What county is New Castle in?

Garfield County. All of its residents live in that county.

What ZIP codes cover New Castle?

1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 81647.

How far is New Castle from Denver?

135.6 miles (218.3 km) in a straight line, heading E from New Castle.

What is the nearest larger city to New Castle?

Glenwood Springs, CO, with 10,311 residents, 10.0 miles away between internal points.

Sources and data as of

Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.

How every number is computed: methodology. Spotted a wrong figure? Report an error.